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RISA 4DVAR System for the Navy Coastal Ocean Model. Part II: Strong and Weak Constraint Assimilation Experiments with Real Observations in Monterey Bay
Publisher: American Meteorological Society
Abstract: four-dimensional variational data assimilation (4DVAR) system was recently developed for the Navy Coastal Ocean Model (NCOM). The system was tested in the first part of this study using synthetic surface and subsurface ...
A 4DVAR System for the Navy Coastal Ocean Model. Part I: System Description and Assimilation of Synthetic Observations in Monterey Bay
Publisher: American Meteorological Society
Abstract: 4D variational data assimilation system was developed for assimilating ocean observations with the Navy Coastal Ocean Model. It is described in this paper, along with initial assimilation experiments in Monterey Bay using ...
A Variational Assimilation System for Nearshore Wave Modeling
Publisher: American Meteorological Society
Abstract: variational data assimilation system is developed for the stationary, homogeneous portion of the wave model Simulating Waves Nearshore (SWAN). The system is based on a numerical adjoint constructed for the discrete forward ...
Generalized Inverse of a Reduced Gravity Primitive Equation Ocean Model and Tropical Atmosphere–Ocean Data
Publisher: American Meteorological Society
Abstract: A nonlinear 2½-layer reduced gravity primitive equations (PE) ocean model is used to assimilate sea surface temperature (SST) data from the Tropical Atmosphere?Ocean (TAO) moored buoys in the tropical Pacific. The aim of ...
Impact of Assimilating Surface Velocity Observations on the Model Sea Surface Height Using the NCOM-4DVAR
Publisher: American Meteorological Society
Abstract: he assimilation of surface velocity observations and their impact on the model sea surface height (SSH) is examined using an operational regional ocean model and its four-dimensional variational data assimilation (4DVAR) ...
Weak and Strong Constraints Variational Data Assimilation with the NCOM-4DVAR in the Agulhas Region Using the Representer Method
Publisher: American Meteorological Society
Abstract: he difference between the strong and weak constraints four-dimensional variational (4DVAR) analyses is examined using the representer method formulation, which expresses the analysis as the sum of a first guess and a finite ...
Examining the Potential Impact of SWOT Observations in an Ocean Analysis–Forecasting System
Publisher: American Meteorological Society
Abstract: ASA?s Surface Water and Ocean Topography (SWOT) satellite, scheduled for launch in 2020, will provide observations of sea surface height anomaly (SSHA) at a significantly higher spatial resolution than current satellite ...
Do Assimilated Drifter Velocities Improve Lagrangian Predictability in an Operational Ocean Model?
Publisher: American Meteorological Society
Abstract: he Lagrangian predictability of general circulation models is limited by the need for high-resolution data streams to constrain small-scale dynamical features. Here velocity observations from Lagrangian drifters deployed ...
Impact of Assimilating Ocean Velocity Observations Inferred from Lagrangian Drifter Data Using the NCOM-4DVAR
Publisher: American Meteorological Society
Abstract: ulerian velocity fields are derived from 300 drifters released in the Gulf of Mexico by The Consortium for Advanced Research on Transport of Hydrocarbon in the Environment (CARTHE) during the summer 2012 Grand Lagrangian ...
A Multiscale Approach to High-Resolution Ocean Profile Observations within a 4DVAR Analysis System
Publisher: American Meteorological Society
Abstract: Most ocean data assimilation systems are tuned to process and assimilate observations to constrain features on the order of the mesoscale and larger. Typically this involves removal of observations or computing averaged ...